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The Vinvocci were green, spiky humanoids. They resembled the Zocci, but were taller and green. (TV: The End of Time) They also resembled Meglos after he took over the body of George Morris, though this was not the typical look of Meglos's species. (TV: Meglos)

Rossiter and Addams used shimmers to appear as humans. These devices, disguised as a wristwatch, allowed Rossiter and Addams to work for Joshua Naismith undetected. However the device was uncomfortable to use.

The Vinvocci had a medical device, dubbed the Immortality Gate by Humans, which was capable of healing "whole planets".

In December 2009, a salvage team, consisting of Rossiter and Addams, arrived on Earth to find the Immortality Gate. The Gate had been reactivated by humans, and had sent out a signal which attracted the pair. They infiltrated the company of Joshua Naismith, under the guise of two human scientists. They were trying to repair the Immortality Gate, but the Master stopped their plans by using it to transform every human on Earth into duplicates of himself.

The Vinvocci, unaffected due to their alien nature, helped the Tenth Doctor and Wilfred Mott escape the Master, bringing them to their ship. They later helped the Doctor return to the Naismith mansion, dropping off Wilfred Mott shortly after. They then departed, unwilling to involve themselves any further in the conflict. (TV: The End of Time)

The original makeup design for the Vinvocci was not completely green. After principal photography had finished, Russell T Davies reconsidered the creatures' design and decided to have the footage digitally recoloured. (PCOM: The End of Time)